Below is a graphic that matches Au oxide free milling gold ore...

Below is a graphic that matches Au oxide free milling gold ore grade to CIL industry standard processing plants with various processing capacities. We have been told that Rox is likely to use a 480 Ktpa low Capex plant.
Conclusions:
None of the blue and green zones including all the pits can be part of the start up using a 480 Mtpa plant. That includes Grace which on reflection and thanks Fangk and others who correctly pointed out that the AISC on Grace will be higher than $1000 oz Au (nuggety characteristics so unfavourable strip ratio for a 480 Ktpa plant).
However, as the diagram shows Rox has multiple possibilities for high grade oxide gold close to the surface. Worth noting that the diagram is very out of date so we can expect to see more high grade ore in the next resource update. A 480 Ktpa plant processing ore with grades 4g/t - 10g/t free milling gold is likely to be generate a strong cash flow. Of course the 480 Ktpa plant is just the start. The shallow gold and the Youanmi main lode will be processed as the plant size is progressively upgraded, likely using the profits from the initial small plant.
As always imo DYOR.